CAJ | 학술논문

循环伏安法结合原位拉曼光谱的表征结果表明,烟酸在铁钝化膜层表面的吸附行为归因于其具有形成稳定膜层复合物的性能,烟酸将间隙离子FeⅡ转化为稳定的晶格离子FeⅢ,从而降低铁钝化膜的溶解性.旋转电极电化学晶体微天平的分析结果表明烟酸在活化态和钝化态铁表面的吸附行为遵循LangmuirFreundlich热力学规律,并由此计算出过程中的吸附常数、标准自由能和非均质分布常数.研究认为有机分子在钝化膜表面为化学型吸附,可导致钝化膜破坏的间隙离子被烟酸固定在八面体空位晶格中形成稳定晶型结构,并通过扫描电镜(SEM)和衰减全反射红外光谱(ATR FTIR)分析对结论进行了再次验证.
순배복안법결합원위랍만광보적표정결과표명,연산재철둔화막층표면적흡부행위귀인우기구유형성은정막층복합물적성능,연산장간극리자FeⅡ전화위은정적정격리자FeⅢ,종이강저철둔화막적용해성.선전전겁전화학정체미천평적분석결과표명연산재활화태화둔화태철표면적흡부행위준순LangmuirFreundlich열역학규률,병유차계산출과정중적흡부상수、표준자유능화비균질분포상수.연구인위유궤분자재둔화막표면위화학형흡부,가도치둔화막파배적간극리자피연산고정재팔면체공위정격중형성은정정형결구,병통과소묘전경(SEM)화쇠감전반사홍외광보(ATR FTIR)분석대결론진행료재차험증.
Cyclic voltammetry and in situ Raman spectroscopy were used to determine the adsorption mechanism of nicotinic acid onto passive iron film surface.Its ability to form a surface complex tends to stabilize the interstitial FeⅡ in FeⅢ states and results in the progressive development of an insoluble film.Furthermore,an analytical investigation using a rotating electrochemical quartz crystal microbalance (rEQCM) showed that the adsorption isotherms of nicotinic acid onto iron in the active and passive states followed Langmuir-Freundlich behavior from which the adsorption constant,standard free energy of adsorption,and heterogeneity could be calculated.The organic molecules attach to the film surface by chemisorption and the interstitial cations are fixed in the octahedral sites giving stable nanocrystals.These assumptions were confirmed by scanning electron microscopy (SEM) and attenuated total reflection transform infrared (ATR FTIR) spectroscopy.